CN110104032B - Vehicle arrival forecasting method and device and computer readable storage medium - Google Patents
Vehicle arrival forecasting method and device and computer readable storage medium Download PDFInfo
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Abstract
The application discloses a vehicle arrival forecasting method and device and a computer readable storage medium, wherein the method comprises the steps of calculating the remaining time length of a vehicle for reaching the next station, and comparing the remaining time length with the size of a preset time length threshold; if the remaining time length is less than or equal to the time length threshold, sending a vehicle pre-arrival notification; continuously calculating the remaining time length, and comparing the remaining time length with the sum of the time length threshold and the preset jitter compensation time; if the remaining time length is less than or equal to the sum of the time length threshold and the jitter compensation time, the steps of continuously calculating the remaining time length and comparing the remaining time length with the sum of the time length threshold and the jitter compensation time are executed circularly. According to the method and the device, the residual time length and the sum of the time length threshold value and the preset jitter compensation time are compared, most of jitters in the normal fluctuation range are filtered, and the reliability and the safety of the train control system are improved.
Description
Technical Field
The present application relates to, but not limited to, the technical field of train operation control, and in particular, to a method and an apparatus for vehicle arrival forecasting, and a computer-readable storage medium.
Background
When an intra-city railway Train (such as a subway, a light rail, and a maglev Train) or an inter-city Train (such as a high-speed rail or another ordinary Train) travels, an Automatic Train Control (ATC) is generally required. The ATC is a system for controlling the running direction, running interval and running speed of a train by a technical means, ensuring the safe running of the train and improving the running efficiency, which is called a train control system for short. ATC is classified into Automatic Train Protection (ATP), Automatic Train Operation (ATO), Automatic Train Supervision (ATS), and Computer Based Interlocking (CI). The ATC also needs to provide a series of information related to the train to the outside to implement interconnection and even integration with other related automation systems, such as Integrated Supervisory Control System (ISCS), which are collectively referred to as ATC external systems or interconnection systems. The train information usually includes whether the train is about to arrive at the next station platform and stop passengers, which is called pre-arrival information for short, or pre-arrival (PreArrival, PreA), and usually adopts logic quantities 0 and 1 to represent that the pre-arrival is true, that is, the train is about to arrive at the next station platform and stop; 0 indicates all other situations than 1, such as the train is not yet about to arrive at the station or the train will skip the station. Note that the ATC will first determine that the train will stop at that station before considering whether to trigger the PreA, which will not be emphasized below.
After receiving the PreA of 1, the ISCS usually will trigger a broadcast (PA) system to perform train inbound broadcast and other linkage, such as lighting up the station platform illumination. It can be seen that timeliness and stability of the PreA (stability of the PreA generally means that the PreA should not be subject to allergy shaking from 0 to 1 or from 1 to 0) are very important, and an untimely PreA may cause the ISCS not to trigger the inbound broadcast in time, while an unstable PreA may cause frequent or even wrong broadcast triggering, which may affect train operation and station order.
The ATC will dynamically calculate how long it will take to reach the next station, and let us note this as the remaining time length, denoted by N, which may be in seconds. Obviously, N is a non-negative number.
The traditional train pre-arrival signal judging and setting method of the train control system comprises the following steps:
as shown in fig. 1, during the forward process of the train, the ATC continuously calculates the current dynamic N value, and when 0 < N ≦ N0(N0 represents a predetermined constant, for example, 60 seconds, which may be a configurable constant), then PreA is 1; other situations, including when the train has arrived at the station (N-0), and when N > N0, the PreA is set to 0.
The method has the disadvantages that after N is not more than N0 for the first time, if the train encounters the conditions of speed reduction, speed limit and the like, so that N is more than N0, the condition that the value of PreA shakes 1 → 0 → 1 for multiple times often occurs, and because PreA changes from 1 to 0, if no other signal action (such as train departure) exists, any action is usually not triggered, so that the value of PreA shakes for multiple times in a short time, and the PA system is unnecessarily triggered for train arrival broadcasting and other linkage for multiple times.
Disclosure of Invention
The application provides a vehicle arrival forecasting method and device and a computer readable storage medium, which can filter most of jitter in a normal fluctuation range and improve the reliability and safety of a train control system.
The embodiment of the invention provides a vehicle arrival forecasting method, which comprises the following steps:
calculating the remaining time length of the vehicle reaching the next station, and comparing the remaining time length with a preset time length threshold value;
if the remaining time length is less than or equal to the time length threshold, sending a vehicle pre-arrival notification;
continuously calculating the remaining time length of the vehicle reaching the next station, and comparing the remaining time length with the sum of the time length threshold and preset jitter compensation time;
and if the residual time length is less than or equal to the sum of the time length threshold and the preset jitter compensation time, circularly executing the steps of continuously calculating the residual time length of the vehicle reaching the next station and comparing the residual time length with the sum of the time length threshold and the preset jitter compensation time.
In an exemplary embodiment, when the calculating the remaining time length of the vehicle to reach the next station and comparing the remaining time length with a preset time length threshold, the method further comprises:
and if the remaining time length is larger than the time length threshold value, circularly executing the steps of calculating the remaining time length of the vehicle reaching the next station and comparing the remaining time length with the preset time length threshold value.
In one exemplary embodiment, after said sending a vehicle pre-arrival notification, said method further comprises:
and if the remaining time length is greater than the sum of the time length threshold and the jitter compensation time, sending a notice of canceling the vehicle arrival in advance, circularly executing the steps of calculating the remaining time length of the vehicle to the next station and comparing the remaining time length with the preset time length threshold.
In an exemplary embodiment, the method further comprises:
counting the number of times of jitter of the residual time length in the vicinity of the time length threshold, wherein one-time jitter means that the residual time length calculated at the time T is greater than the time length threshold, the residual time length calculated from (T +1) to (T + M) is less than or equal to the time length threshold, the residual time length calculated at the time T + M +1 is greater than the time length threshold, T is any one calculation time, T + M is the Mth calculation time after the time T, and M is a natural number greater than or equal to 1;
and if the jitter frequency is greater than a preset jitter frequency threshold value, sending a vehicle state abnormity notification.
In an exemplary embodiment, the calculating the remaining time length for the vehicle to reach the next station includes:
acquiring current vehicle running speed information and distance information between the current vehicle and a next station in real time;
and calculating the time required by the vehicle to reach the next station according to the current vehicle running speed information and the distance information between the current vehicle and the next station which are obtained in real time, and taking the calculated time as the remaining time length of the vehicle to reach the next station.
Embodiments also provide a computer readable storage medium, which stores one or more programs, which are executable by one or more processors to implement the steps of the vehicle arrival forecasting method as described in any one of the above.
The embodiment of the invention also provides a vehicle arrival forecasting device, which comprises a processor and a memory, wherein: the processor is adapted to execute a program stored in the memory to implement the steps of the vehicle arrival forecasting method as claimed in any one of the above.
The embodiment of the invention also provides a vehicle arrival forecasting device, which comprises a calculation and comparison module and a processing module, wherein:
the calculation and comparison module is used for calculating the remaining time length of the vehicle reaching the next station, comparing the remaining time length with a preset time length threshold value, and sending a first notice to the processing module if the remaining time length is less than or equal to the time length threshold value; after receiving the second notification of the processing module, continuously calculating the remaining time length of the vehicle reaching the next station, and comparing the remaining time length with the sum of the time length threshold and the preset jitter compensation time, if the remaining time length is less than or equal to the sum of the time length threshold and the preset jitter compensation time after receiving the second notification of the processing module, circularly executing the step of continuously calculating the remaining time length of the vehicle reaching the next station, and comparing the remaining time length with the sum of the time length threshold and the preset jitter compensation time;
and the processing module is used for receiving the first notice of the calculation and comparison module, sending a notice that the vehicle arrives at the station in advance and sending a second notice to the calculation and comparison module.
In an exemplary embodiment, the calculation and comparison module is further configured to, after receiving the second notification from the processing module, send a third notification to the processing module if the remaining time length is greater than the sum of the time length threshold and the jitter compensation time; receiving a fourth notification of the processing module, circularly executing the steps of calculating the remaining time length of the vehicle reaching the next station, and comparing the remaining time length with a preset time length threshold value;
the processing module is further used for receiving a third notice of the calculation and comparison module, sending a notice of canceling the vehicle pre-arrival, and sending the fourth notice to the calculation and comparison module.
In an exemplary embodiment, the calculation comparing module is further configured to count the number of times of jitter of the remaining time length around the time length threshold, where a jitter means that the remaining time length calculated at time T is greater than the time length threshold, the remaining time length calculated at time (T +1) to (T + M) is less than or equal to the time length threshold, and the remaining time length calculated at time (T + M +1) is greater than the time length threshold, where T is any one of the calculation times, T + M is the mth calculation time after time T, and M is a natural number greater than or equal to 1; if the jitter frequency is greater than a preset jitter frequency threshold value, sending a fifth notification to the processing module;
the processing module is further used for receiving the fifth notification of the calculation and comparison module and sending a vehicle state abnormity notification.
Compared with the prior art, the vehicle arrival forecasting method and device and the computer readable storage medium filter most of the jitter in the normal fluctuation range and improve the reliability and safety of a train control system by comparing the residual time length with the sum of the time length threshold and the preset jitter compensation time after the vehicle arrival forecasting notice is sent, and the method is simple and easy to understand, does not need to rely on high-performance software and hardware, and is suitable for any software/hardware platform.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the application may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification, claims, and drawings.
Drawings
The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
Fig. 1 is a schematic diagram illustrating a vehicle arrival forecasting method in the related art;
fig. 2 is a schematic flow chart of a vehicle arrival forecasting method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a vehicle arrival forecasting method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a vehicle arrival forecasting device according to an embodiment of the present invention.
Detailed Description
The present application describes embodiments, but the description is illustrative rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or instead of any other feature or element in any other embodiment, unless expressly limited otherwise.
The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in this application may also be combined with any conventional features or elements to form a unique inventive concept as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive aspects to form yet another unique inventive aspect, as defined by the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not limited except as by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.
Further, in describing representative embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other orders of steps are possible as will be understood by those of ordinary skill in the art. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Further, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present application.
In the conventional train arrival signal judgment and setting method for the train of the train control system, the current N value is continuously and dynamically calculated when the train moves forward, when the N is less than or equal to N0 for the first time (the N value at the moment is specially recorded as Na, obviously, Na is less than or equal to N0), the value of PreA is changed from 0 to 1, and then, under the normal condition, the train really continuously and normally drives in until the train arrives at the platform, namely, within the next Na seconds, the dynamic N meets N < Na, and because Na is less than or equal to N0, N is less than or equal to N0, the PreA is maintained to 1, obviously, the expected normal working condition is realized. However, "unexpected" (double quotes refer to what is considered herein as "unexpected" and in most cases should not be considered as a true unexpected) always occurs, and the train may encounter deceleration, speed limit, etc. for some time after Na, and at this time, the recalculated N value may satisfy N > N0. Then, according to the above conventional method, it is apparent that PreA will be reset to 0, after which N ≦ N0 will inevitably again occur and PreA will again be set to 1. Obviously, the value of PreA changes by 1 → 0 → 1 once, and if the 1 → 0 → 1 change is short, we will generally refer to it as a dither.
Since PreA ═ 1 is commonly used for linkage of station entrance broadcasting and platform lighting, that is: when the PreA is changed from 0 to 1, the station entering broadcast is usually triggered, and the platform illumination lighting action may also be triggered; when the PreA is changed from 1 to 0, if no other signal action (such as train departure) exists, no action is usually triggered, but when the PreA is changed from 0 to 1 in a short time, the station arrival broadcasting and the platform illumination lighting action are triggered again, obviously, the station arrival broadcasting and the platform illumination lighting action which are triggered again are unnecessary, and if the shaking of the PreA occurs frequently, the action can be triggered frequently, and the accident is caused. It is generally believed that the data provider, ATC, should mask such jitter itself, since such jitter is not readily available to external systems, or such jitter, if provided directly to external systems without filtering, may be a real accident or even an accident. Of course, if the ATC detects frequent jitter of the PreA in a short time, the ATC should indicate the abnormal state of the train.
Aiming at the defect that the shaking compensation time is not effectively considered for the externally provided PreA signal in the traditional method, which may cause the wrong linkage of an ATC interconnection system, the shaking compensation time technology of the application can be utilized to effectively shield the PreA shaking inside the ATC, and the PreA stability problem brought by the traditional method is solved, so that the PreA is safe and reliable no matter the PreA is used in the ATC or the external interconnection or integration system. Therefore, the present application can fundamentally prevent erroneous linkage and accidents caused by the PreA dithering.
Embodiment a method for forecasting arrival of a vehicle
As shown in fig. 2, a vehicle arrival forecasting method according to an embodiment of the present invention includes the steps of:
step 201: calculating the remaining time length of the vehicle reaching the next station, and comparing the remaining time length with a preset time length threshold value; if the remaining time length is less than or equal to the time length threshold, go to step 202;
in an exemplary embodiment, the calculating the remaining time length for the vehicle to reach the next station includes:
acquiring current vehicle running speed information and distance information between the current vehicle and a next station in real time;
and calculating the time required by the vehicle to reach the next station according to the current vehicle running speed information and the distance information between the current vehicle and the next station which are obtained in real time, and taking the calculated time as the remaining time length of the vehicle to reach the next station.
In an exemplary embodiment, the step 201 further includes:
if the remaining time length is greater than the time length threshold, the step 201 is executed in a loop.
Step 202: sending a vehicle pre-arrival notification;
it should be noted that, in the ATC system, the vehicle pre-arrival notification is sent to an external system or an interconnected system of the ATC, for example, the ISCS system. In one exemplary embodiment, the vehicle pre-arrival notification may be transmitted in such a manner that the value of the pre-arrival information PreA is set from 0 (false) to 1 (true).
Step 203: continuously calculating the remaining time length of the vehicle reaching the next station, and comparing the remaining time length with the sum of the time length threshold and preset jitter compensation time; if the remaining time length is less than or equal to the sum of the time length threshold and the preset jitter compensation time, the step 203 is executed in a loop.
In an exemplary embodiment, the step 203 further comprises: if the remaining time length is greater than the sum of the time length threshold and the jitter compensation time, go to step 204;
step 204: and sending a notice of canceling the vehicle pre-arrival, and executing the step 201 in a circulating way.
It should be noted that, in the ATC system, the cancellation vehicle pre-arrival notification is sent to an external system or an interconnected system of the ATC, for example, the ISCS system. In one exemplary embodiment, the manner of transmitting the cancel vehicle pre-arrival notification may be to set the value of the pre-arrival information PreA from 1 (true) to 0 (false).
In an exemplary embodiment, the method further comprises:
counting the number of times of jitter of the residual time length in the vicinity of the time length threshold, wherein one-time jitter means that the residual time length calculated at the time T is greater than the time length threshold, the residual time length calculated from (T +1) to (T + M) is less than or equal to the time length threshold, the residual time length calculated at the time T + M +1 is greater than the time length threshold, T is any one calculation time, T + M is the Mth calculation time after the time T, and M is a natural number greater than or equal to 1;
and if the jitter frequency is greater than a preset jitter frequency threshold value, sending a vehicle state abnormity notification.
Aiming at the defect that the shaking of a PreA signal provided by the traditional method is not effectively considered, and the wrong linkage of an ATC interconnection system can be caused, the vehicle arrival forecasting method can effectively shield the shaking of the PreA in the ATC, and solves the problem of PreA stability, so that the wrong linkage and accidents caused by the PreA shaking are fundamentally avoided.
As shown in fig. 3, we set a value N1 at a position Δ N seconds before N0 (we particularly refer to Δ N as jitter compensation time, Δ N should be an industry-recognized empirical or normative value, configurable, e.g., Δ N is one third of N0, etc.), N1 > N0, obviously N1-N0 ═ Δ N, or N1 ═ N0 +/Δ N.
During the process of the train moving forward, the current dynamic N value is continuously calculated, obviously, the calculated dynamic N is all N > N0 in the beginning period of time, and N is not more than N0 at a certain moment, as mentioned above, we especially remember that the N value at this moment is Na, and then the value of PreA is changed from 0 to 1.
After that, in most cases, the train does continue to normally drive in until reaching the platform, i.e. the PreA will be maintained at 1 in the next Na seconds, which is obviously the expected normal working condition, and the traditional method has no problem in this condition. Next, we consider that an "unexpected" situation occurs, and the train encounters deceleration, speed limit, etc. some time after Na, at this time, the recalculated N value may satisfy N > N0, and then according to the above conventional method, the pre a is reset to 0, which is obviously not the desired result. In the present application, the phenomenon that N > N0 is entered again shortly after a certain period after PreA ═ 1 is completely a normal fluctuation, and it is not desirable to consider it as a real accident and then to reset PreA ═ 0 again. The inventor of the present application finds that most of such fluctuations certainly satisfy N ≦ N1, that is, N ≦ N0 +/Δ N, at this time, the present application will continue to maintain the value of PreA ≦ 1, and as the train continues to further approach the platform, a new N subsequently satisfies N ≦ N0 again until finally entering the platform, and during this period, the vehicle arrival forecasting method according to the embodiment of the present application will maintain the value of PreA ≦ 1 without jitter.
In summary, the smaller Δ N is, the poorer the anti-jitter capability is, and obviously, considering the limit case, when Δ N is 0, the effect of the present application is completely the same as that of the conventional method; the larger the Δ N is, the larger the anti-shake capability is. As mentioned above, in actual use, the Delta N is an industry experience value and is a reasonable Delta N, and by combining the vehicle arrival forecasting method, most of jitters in a normal fluctuation range can be filtered, so that the reliability and the safety of a train control system are improved.
In an exemplary embodiment, the value of the jitter compensation time Δ N may be modified online by the ATC system, or dynamically or statically configured by a configuration file.
It should be noted that the specific values of N0 or N1 are not critical points or protection points of the present application, and therefore, any different forms of N0 and N1 belong to alternatives to the embodiments of the present application based on the technical solutions of the embodiments of the present application.
According to the vehicle arrival forecasting method, after the ATC judges the station PreA to be 1 for the first time, the dynamic N value obtained by recalculation is considered to be PreA to be 1 as long as N is more than 0 and less than or equal to N0 plus delta N, and effective shielding of PreA normal jitter is achieved inside the ATC.
Example two computer-readable storage Medium
Embodiments also provide a computer readable storage medium, which stores one or more programs, which are executable by one or more processors to implement the steps of the vehicle arrival forecasting method as described in any one of the above.
Third embodiment vehicle arrival forecasting apparatus
The embodiment of the invention also provides a vehicle arrival forecasting device, which comprises a processor and a memory, wherein: the processor is adapted to execute a program stored in the memory to implement the steps of the vehicle arrival forecasting method as claimed in any one of the above.
Embodiment four-vehicle arrival forecasting device
As shown in fig. 4, a vehicle arrival forecasting device according to an embodiment of the present invention includes a calculation and comparison module 401 and a processing module 402, wherein:
the calculation and comparison module 401 is configured to calculate a remaining time length of the vehicle reaching a next station, compare the remaining time length with a preset time length threshold, and send a first notification to the processing module 402 if the remaining time length is less than or equal to the time length threshold; after receiving the second notification of the processing module 402, continuing to calculate the remaining time length of the vehicle reaching the next station, and comparing the remaining time length with the sum of the time length threshold and the preset jitter compensation time, if the remaining time length is less than or equal to the sum of the time length threshold and the preset jitter compensation time after receiving the second notification of the processing module 402, circularly executing the step of continuing to calculate the remaining time length of the vehicle reaching the next station, and comparing the remaining time length with the sum of the time length threshold and the preset jitter compensation time;
the processing module 402 is configured to receive the first notification from the calculation and comparison module 401, send a vehicle pre-arrival notification, and send a second notification to the calculation and comparison module 401.
In an exemplary embodiment, when the calculating the remaining time length of the vehicle to reach the next station and comparing the remaining time length with the preset time length threshold, the calculating and comparing module 401 is further configured to,
and if the remaining time length is larger than the time length threshold value, circularly executing the steps of calculating the remaining time length of the vehicle reaching the next station and comparing the remaining time length with the preset time length threshold value.
In an exemplary embodiment, the calculating the remaining time length of the vehicle to reach the next station by the calculating and comparing module 401 comprises:
acquiring current vehicle running speed information and distance information between the current vehicle and a next station in real time;
and calculating the time required by the vehicle to reach the next station according to the current vehicle running speed information and the distance information between the current vehicle and the next station which are obtained in real time, and taking the calculated time as the remaining time length of the vehicle to reach the next station.
In an exemplary embodiment, the calculation and comparison module 401 is further configured to, after receiving the second notification from the processing module 402, send a third notification to the processing module 402 if the remaining time length is greater than the sum of the time length threshold and the jitter compensation time; receiving a fourth notification from the processing module 402, circularly executing the steps of calculating the remaining time length of the vehicle reaching the next station, and comparing the remaining time length with a preset time length threshold;
the processing module 402 is further configured to receive a third notification from the calculation and comparison module 401, send a notification of canceling the vehicle pre-arrival, and send the fourth notification to the calculation and comparison module 401.
It should be noted that, in the ATC system, the vehicle pre-arrival notification or the cancellation of the vehicle pre-arrival notification is sent to an external system or an interconnected system of the ATC, for example, in the ISCS system. In one exemplary embodiment, the vehicle pre-arrival notification may be transmitted by setting a value of the pre-arrival information PreA from 0 (false) to 1 (true); the manner of sending the cancel vehicle pre-arrival notification may be to set the value of the pre-arrival information PreA from 1 (true) to 0 (false).
In an exemplary embodiment, the calculation and comparison module 401 is further configured to count the number of times of jitter of the remaining time length around the time length threshold, where a jitter means that the remaining time length calculated at time T is greater than the time length threshold, the remaining time length calculated at time (T +1) to (T + M) is less than or equal to the time length threshold, and the remaining time length calculated at time (T + M +1) is greater than the time length threshold, where T is any one calculation time, T + M is the mth calculation time after time T, and M is a natural number greater than or equal to 1; if the jitter frequency is greater than the preset jitter frequency threshold, sending a fifth notification to the processing module 402;
the processing module 402 is further configured to receive the fifth notification from the calculation and comparison module 401, and send a notification of abnormal vehicle state.
In an exemplary embodiment, the value of the jitter compensation time Δ N may be modified online by the ATC system, or dynamically or statically configured by a configuration file.
It should be noted that the specific values of N0 or N1 are not critical points or protection points of the present application, and therefore, any different forms of N0 and N1 belong to alternatives to the embodiments of the present application based on the technical solutions of the embodiments of the present application.
According to the vehicle arrival forecasting device, after the ATC judges the station PreA to be 1 for the first time, the dynamic N value obtained by recalculation is considered to be PreA to be 1 as long as N is more than 0 and less than or equal to N0 plus delta N, and effective shielding of PreA normal jitter is achieved inside the ATC.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
Claims (8)
1. A vehicle arrival forecasting method, comprising:
calculating the remaining time length of the vehicle reaching the next station, and comparing the remaining time length with a preset time length threshold value;
if the remaining time length is less than or equal to the preset time length threshold value, sending a vehicle pre-arrival notification;
continuously calculating the remaining time length of the vehicle reaching the next station, and comparing the remaining time length with the sum of the preset time length threshold and the preset jitter compensation time;
if the remaining time length is less than or equal to the sum of the preset time length threshold and the preset jitter compensation time, circularly executing the steps of continuously calculating the remaining time length of the vehicle reaching the next station and comparing the remaining time length with the sum of the preset time length threshold and the preset jitter compensation time;
and if the remaining time length is greater than the sum of the preset time length threshold and the preset jitter compensation time, sending a notice of canceling the vehicle arrival in advance, circularly executing the steps of calculating the remaining time length of the vehicle arriving at the next station and comparing the remaining time length with the preset time length threshold.
2. The vehicle arrival forecasting method according to claim 1, wherein when the calculating of the remaining time length of the vehicle to reach the next station and the comparing of the remaining time length with the magnitude of the preset time length threshold, the method further comprises:
and if the remaining time length is larger than the preset time length threshold value, circularly executing the steps of calculating the remaining time length of the vehicle reaching the next station and comparing the remaining time length with the preset time length threshold value.
3. The vehicle arrival forecasting method according to claim 1, further comprising:
counting the number of times of jitter of the remaining time length near the preset time length threshold, wherein one-time jitter means that the remaining time length calculated at the time T is greater than the preset time length threshold, the remaining time length calculated from (T +1) to (T + M) is less than or equal to the preset time length threshold, and the remaining time length calculated at the time T + M +1 is greater than the preset time length threshold, wherein T is any one calculation time, T + M is the Mth calculation time after the time T, and M is a natural number greater than or equal to 1;
and if the jitter frequency is greater than a preset jitter frequency threshold value, sending a vehicle state abnormity notification.
4. The vehicle arrival forecasting method as claimed in claim 1, wherein the calculating of the remaining time length of the vehicle to reach the next station includes:
acquiring current vehicle running speed information and distance information between the current vehicle and a next station in real time;
and calculating the time required by the vehicle to reach the next station according to the current vehicle running speed information and the distance information between the current vehicle and the next station which are obtained in real time, and taking the calculated time as the remaining time length of the vehicle to reach the next station.
5. A computer readable storage medium, characterized in that the computer readable storage medium stores one or more programs which are executable by one or more processors to implement the steps of the vehicle arrival forecasting method as recited in any one of claims 1 to 4.
6. A vehicle arrival forecasting apparatus comprising a processor and a memory, wherein: the processor is configured to execute a program stored in the memory to implement the steps of the vehicle arrival forecasting method according to any one of claims 1 to 4.
7. A vehicle arrival forecasting device is characterized by comprising a calculation and comparison module and a processing module, wherein:
the calculation and comparison module is used for calculating the remaining time length of the vehicle reaching the next station, comparing the remaining time length with a preset time length threshold value, and sending a first notice to the processing module if the remaining time length is less than or equal to the preset time length threshold value; after receiving the second notification of the processing module, continuously calculating the length of the remaining time for the vehicle to reach the next station, and comparing the length of the remaining time with the sum of the preset time length threshold and the preset jitter compensation time, if the length of the remaining time is less than or equal to the sum of the preset time length threshold and the preset jitter compensation time after receiving the second notification of the processing module, circularly executing the step of continuously calculating the length of the remaining time for the vehicle to reach the next station, and comparing the length of the remaining time with the sum of the preset time length threshold and the preset jitter compensation time; the processing module is further configured to send a third notification to the processing module if the remaining time length is greater than the sum of the preset time length threshold and the preset jitter compensation time after receiving the second notification from the processing module; receiving a fourth notification of the processing module, circularly executing the steps of calculating the remaining time length of the vehicle reaching the next station, and comparing the remaining time length with a preset time length threshold value;
the processing module is used for receiving the first notification of the calculation and comparison module, sending a vehicle pre-arrival notification and sending a second notification to the calculation and comparison module; and the system is also used for receiving a third notice of the calculation and comparison module, sending a notice of canceling the vehicle arrival in advance, and sending a fourth notice to the calculation and comparison module.
8. The vehicle arrival forecast apparatus according to claim 7,
the calculation and comparison module is further configured to count the number of times of jitter of the remaining time length in the vicinity of the preset time length threshold, where one-time jitter refers to a time point at which the remaining time length calculated at the time point T is greater than the preset time length threshold, the time point (T +1) to (T + M) is smaller than or equal to the preset time length threshold, and the time point (T + M +1) is greater than the preset time length threshold, where T is any one calculation time point, T + M is the mth calculation time point after the time point T, and M is a natural number greater than or equal to 1; if the jitter frequency is greater than a preset jitter frequency threshold value, sending a fifth notification to the processing module;
the processing module is further used for receiving the fifth notification of the calculation and comparison module and sending a vehicle state abnormity notification.
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